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Method of Increasing pH of High-Density Brines

a high-density brine and brine technology, applied in the field of brine fluids, can solve the problems of limiting the use and application of brine, undesirable brine characteristics, and limiting the density of brine solutions made by dissolving salts in water, and achieves low ph in aqueous solutions and high corrosion losses

Inactive Publication Date: 2011-07-21
BAKER HUGHES INC
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AI Technical Summary

Problems solved by technology

The density of these solutions made by dissolving these salts in water is limited by the molecular weight and the solubility of that salt.
The acid content of these fluids give the brines undesirable characteristics, one of the greatest of which are high corrosion losses that limit the uses and applications of these fluids.

Method used

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Examples

Experimental program
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Effect test

examples 1-2

[0031]Brine solutions containing various amounts of soluble sodium carbonates or bicarbonates were prepared. These solutions were prepared by vigorously stirring a high-density brine solution to which had been added a powdered carbonate or bicarbonate. The resultant solution is purged with nitrogen to remove dissolved carbon dioxide gas. The resultant solutions were tested at 350° F. (177° C.) for 24 hours on N-80 tubing steel, as shown in Table I.

TABLE IRaising pH and Corrosion Resistance Using Sodium BicarbonateInitial fluid density,Resultant density,Corrosion losses,Ex.lb / gal (kg / m3)pH1Additivelb / gal (kg / m3)lbs / ft2 (kg / m2)119.7 (2.36 × 103)5.87None19.7 (2.36 × 103)0.067 (0.33)219.7 (2.36 × 103)6.70DKI-13219.6 (2.35 × 103)0.030 (0.15)1pH was determined in a 1 to 100 diluted solution of the brine in distilled water.2DKI-13 is sodium bicarbonate in powder form.

[0032]It will be appreciated that using the indicated level of additive in accordance with the methods herein that the corro...

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Abstract

It has been discovered that carbonate powders and bicarbonate powders are useful to increase the pH and corrosion resistance of high-density brines, such as zinc bromide brines, without significantly reducing their densities. The carbonates and / or bicarbonates should be water-soluble and may be sodium, potassium, magnesium and / or ammonium carbonates and / or bicarbonates and the like. The carbonates and / or bicarbonates are easily added in powder or other finely divided solid form and are completely dissolved in the brine prior to pumping the brine into a subterranean formation.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part application of U.S. patent application Ser. No. 12 / 134,057, filed Jun. 5, 2008, which is a continuation-in-part application of U.S. patent application Ser. No. 11 / 076,783, filed Mar. 10, 2005, now abandoned, which is a divisional application of U.S. patent application Ser. No. 10 / 726,936 filed Dec. 3, 2003, issued May 17, 2005 as U.S. Pat. No. 6,894,008, which is a continuation-in-part application of U.S. patent application Ser. No. 10 / 192,023 filed Jul. 10, 2002, now abandoned, which in turn claimed the benefit of U.S. Provisional Application No. 60 / 305,036 filed Jul. 11, 2001.TECHNICAL FIELD[0002]The instant invention relates to brine fluids, such as those used in recovering hydrocarbons, and more particularly relates, in one embodiment, to high-density brine fluids with improved corrosion resistance.TECHNICAL BACKGROUND[0003]High-density brine fluids are known to be applied in situations where ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/58
CPCC09K8/54
Inventor WALKER, MICHAEL L.
Owner BAKER HUGHES INC
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